Plaster mesh: pros and cons. Reinforcement with metal mesh for plaster Plastering walls with reinforcing mesh

Facade finishing is one of the most important construction operations. The coating of external walls is exposed to precipitation, cyclic freezing/freezing and exposure to harsh ultraviolet rays. Such difficult operating conditions place increased demands on the quality of finishing. Eliminating defects on façade walls is very expensive and time consuming. You will have to install scaffolding, wait for good weather, and remove construction debris. To eliminate the occurrence of unpleasant situations, you need to take all measures to prevent them.

Finishing of facade walls is carried out using various materials and technologies. Reinforcing stack is used in two cases.

For improvement performance characteristics plaster layer. For such purposes, it is better to use a metal mesh made of galvanized wire.

All metal mesh

The fact is that among the many advantages of foam blocks, you must definitely pay attention to one very significant drawback– low physical strength. Another problem is that concrete blocks begin to crumble when they freeze/thaw under conditions of high specific humidity. Eventually cement plaster begins to peel off with all the negative consequences.

The reinforcing mesh allows the plaster to adhere to the wall surface. Conversations that such a mesh should be used when the plaster is thick, and that this prevents cracks from appearing on the plaster, are only partially confirmed. Firstly, there are simpler and cheaper methods to prevent cracks from appearing in thick plaster. The simplest one is to spread the solution in a thin layer in several stages. Secondly, increase the adhesion of the solution with façade wall possible due to a slight increase in the amount of cement in the solution. If this is not enough, then spray it with cement laitance.

To protect façade wall insulation from damage. Reinforcing facade mesh is used during finishing foam insulation boards.

Not to improve the fixation of glue to the surface of polystyrene foam and to prevent cracks, as some “sofa” builders write, but precisely for mechanical protection.

Why do we say this? The surface of expanded polystyrene is protected from negative impact ultraviolet rays and, oddly enough, damage from birds. For some unknown reason, birds are very fond of pecking at polystyrene foam; if you leave it unprotected, many large and small depressions will soon appear on the surface. Conclusion - polystyrene foam needs to be covered. The cheapest and most reliable method is to use glue.

By the way, the advertising characteristics of manufacturers of plastic reinforcing mesh “they are not afraid of UV” do not in any way affect their actual performance indicators. The fact is that even the most thin layer glue or other cement-sand mixture does not completely pass through ultra-violet rays. Why should the consumer pay for features that he does not need? And one more nuance. Most often, builders fix the reinforcing mesh on the entire wall. We think this is done or out of ignorance physical properties, or the desire to earn more. We recommend using reinforcing mesh to a height of 1.5–2.0 meters; there is no need to go higher. No one will damage the finish screed on the foam that high. Mechanical damage occurs due to various impacts, careless maintenance work near the facade wall, etc.

Types of façade reinforcing mesh

Facade reinforcing mesh is made of galvanized wire or polymers. The former are used for facade plaster, and the latter are used for universal use.

Name	Cell sizes, mm	Roll dimensions, m	a brief description of	Approximate cost, rubles
Safety	2x2	1×50	The material of manufacture is fiberglass, used to reinforce plaster around doors and window openings, for leveling the joints of insulation boards	900
OXISS	5x5	1×50	The mesh has enhanced protection against alkalis and can withstand significant dynamic and static forces over a long period of action.	1050
Fiberglass mesh facade	5x5	1×50	For holding plaster on concrete facades and insulation boards. Withstands a tensile load of at least 1400 N/cm.	1400
STREN S5	22×35	2×25 2×50	Withstands rough and finishing facade plaster up to 5 cm thick.	2750
KREPIKS Facade 1300	4x4	1×50	Fiberglass, protected from alkalis and ultraviolet radiation.	1560
KREPIKS Facade 1500	5x5	1×50	Reduces the likelihood of cracks due to thermal linear expansion	1970
KREPIKS Facade 2000	4x4	1×50	For reinforcing finishing plasters during finishing of the insulating layer of the facade	2300
	6×6, Ø 0.6 mm	1×15	Increased strength, resistant to precipitation and sunlight	1110
	10×10, Ø 0.8 mm	1×15	For drafts facade plasters 3–5 cm thick	1330
	25×25, Ø 1.0 mm	1×25	For strengthening facade walls, universal use. Hot galvanizing of wire, minimum thickness coating 20 microns	1770
TsPVS mesh	20×20, Ø 0.5 mm	1×25	All-metal expanded metal. It has an increased contact area with the façade plaster solution.	580

Modern facade mesh

Prices for construction reinforcing mesh

Construction reinforcing mesh

Metal mesh fixation technology

Metal mesh is used only for cement-sand facade plasters; foam insulation is not finished with it. The reason is the small thickness of the screed on foam boards. But a metal mesh cannot be aligned with such precision; it must be pressed down with a thick layer of mortar. Metal façade reinforcing mesh can withstand great forces; it is used when it is necessary to apply a thick layer of plaster on an uneven base.

The algorithm for fixing it has several features, the implementation of which guarantees the expected effect. The mesh can be laid either vertically or horizontal stripes. This does not matter for the strength of the plaster; decide for yourself how it is more convenient for you to work. How to properly fix a metal mesh to a façade wall?

Step 1. Take the dimensions of the wall and cut the metal mesh along them. Select a cutting tool based on the wire diameter. Universal tool– metal scissors.

If they are not there, then a thin mesh with a wire diameter of up to 0.8 mm can be cut with ordinary scissors. True, after this these scissors will have to be sharpened; they will no longer cut paper.

Prices for construction scissors for metal

Step 2. The metal mesh can be fixed with dowels; the length of the hardware should ensure strong fixation. For facade walls made of foam blocks, you can use ordinary nails 80–90 mm long. They are easily hammered into blocks with an ordinary hammer, and working with them is much faster and easier. Nails are much cheaper than dowels, and the quality of fixation is no different. Use dowels only on brick or concrete facade walls.

Step 3. Electric drill Using a hammer drill, drill the first hole for the mesh. The depth of the holes should be several centimeters longer plastic part. Otherwise, it is impossible to insert the dowel onto desired depth– the hole is slightly filled with brick chips during drilling and reduces its effective depth. It is difficult to remove it from there; it is better to drill more.

Important. The height of the protruding part of the dowels should not exceed the thickness of the plaster mortar. Monitor this parameter over the entire area of the façade wall so that you don’t have to adjust the dowels during plastering.

Step 4. Drill holes along one line at a distance of about fifty centimeters, hang a mesh on each dowel. Pull it a little, do not allow large irregularities. The position of the line does not matter; it can be vertical or horizontal depending on the method of fastening the reinforcing metal mesh.

Step 5. Check the position of the opposite edge of the grid; if it lies unevenly, then move the grid onto adjacent cells.

Fastening plaster mesh- scheme

Step 6. Everything is fine - continue to fix the mesh, install the dowels in a checkerboard pattern. Most metal mesh is one meter wide; to secure it you will need three rows of hardware.

Important. Where two rolls overlap, install the dowels at a distance of approximately 10 cm from the edge. Two strips of reinforcing mesh will be hung simultaneously on these dowels.

Step 7 In the areas of window and door openings, the mesh is cut to size. But there’s nothing wrong if you don’t cut it off, but simply bend it. Just make sure that the edges of the bent sections do not protrude beyond the thickness of the plaster layer.

When plastering such a façade wall, the mortar must be applied in several stages. For the first time, the mass should be slightly thicker than for final leveling. Specific values depend on several indicators and are determined individually, taking into account the practical experience of the master. The consistency of the solution is influenced by the weather, the ability of facade walls to absorb moisture, the linearity of the wall, the maximum parameters of unevenness, etc.

Step-by-step instructions for fixing plastic mesh

The durability of its operation largely depends on the correct implementation of recommendations for installing plastic reinforcing mesh on foam insulation. In all cases, do not rush, work carefully. We have already mentioned that there is no need to reinforce the entire wall height; it is enough to protect only the lower vulnerable area. But these are our recommendations; if you have doubts, protect the entire surface of the façade wall.

Any brand of glue is suitable for gluing the mesh. Study the instructions, it should have high adhesion with plastic materials. In most cases, a finishing layer of adhesive several millimeters thick is applied over the plastic reinforcing mesh. The final coating is done facade paints or a thin layer of decorative plaster.

Step 1. Inspect the surface of the slabs. If they were fixed with dowels, then completely recess the caps and seal the recesses. You can close the gaps at the same time, but this is not necessary. The fact is that the cracks will automatically close during the application of the first layer.

Step 2. On the wall, draw a horizontal line along the height of the reinforcing layer. It will help you monitor the height of glue application. A thin layer of material dries quickly, and this not only causes an increase in material consumption, but also negatively affects the final leveling of the layer for painting.

Step 3. Prepare the glue according to the manufacturer's instructions. Always pour water into the container first, and then add the dry mixture. This technology will greatly simplify the mixing process. You can mix it manually with a trowel or using a mixing attachment for an electric drill.

The second method is not only easier, but also more effective. You need to stir for a few minutes, and then leave the mixture to stand for another 5-6 minutes. During this time, the moisture will be evenly distributed throughout the entire volume, and the smallest dry lumps of glue will completely disappear.

Step 4. The glue is applied to the wall with a spatula; the longer it is, the smoother the resulting surface is. Professionals work with spatulas up to 70 cm in size; beginners can initially use shorter ones.

Practical advice. If you are just learning how to apply glue to a surface, it is better to immediately get used to working with both hands. If one gets tired, use the other hand. Believe me, it is not so difficult, you just need to show a little endurance and patience.

Apply glue to the spatula with a trowel in the center of the tool. The quantity will be determined experimentally. While applying the layer, hold the spatula at an angle to foam boards, press with medium force. Achieve a layer thickness of approximately 2–3 millimeters. Don't prepare right away a large number of surface, for beginners two meters in length is enough. If you do not have time to fix the mesh, the glue will harden, you will have to remove the old layer and make a new one.

Step 5. Try on the location of the plastic reinforcing mesh. If it does not fit into the window opening, trim the material.

Step 6. Glue one end of the mesh, align it horizontally to the length of the prepared section of the wall. Make sure that the mesh lies smoothly without distortions or bends; be guided by a pre-drawn line on the foam.

Practical advice. The mesh should overlap approximately ten centimeters. You may come across recommendations not to apply glue to the overlap of one line, but to do this simultaneously for two rows. We do not recommend doing this, it only complicates the work. Glue the first row of mesh along the entire width at once, including the overlap. The second line will be glued on top of the freshly applied glue. This method simplifies the fixation of the mesh and has a positive effect on quality.

Step 7 Use your hand to press the mesh onto the fresh glue in several places and check its position again.

Step 8 Using a spatula, begin to press the mesh onto the surface of the insulation. Make sure that the glue of the first layer extends over the entire surface and evenly covers the mesh cells on the front side. If there are areas where the adhesive is not thick enough, reapply it over the reinforcing mesh. Such omissions may appear in inexperienced craftsmen. Over time, you will learn to determine by eye optimal thickness There will be no more glue and gaps. Spread excess solution over free surfaces. You shouldn’t try to immediately make the surface perfectly flat, but you need to strive for such a result.

Step 9 Give time for the glue to dry. It is better to leave it overnight; finishing grouting of surfaces is recommended the next day.

That’s all the technology is, the surface of the façade wall is prepared for painting or finishing with other materials. We remind you once again that plastic reinforcing mesh on insulated facades is not used to prevent cracks on the surface of the adhesive, but to prevent mechanical damage to the foam. Keep this in mind when making your decision.

Prices for popular types of putty

Putties

Facade mesh to protect construction sites

Compliance with safety precautions during construction work on multi-storey buildings– one of the main requirements for all developers. This is especially true for facilities built within cities. The façade mesh is fixed to scaffolding and prevents falls construction waste and tools on pedestrian walkways. For such purposes, the cheapest plastic reinforcing mesh is used; after dismantling, it is suitable for direct use.

"Emerald" - a new mesh for scaffolding

Question answer

Is it possible to repair peeled areas with façade reinforcement mesh? It is possible, but it is better to avoid such situations. Unfortunately, in most cases, peeling appears several months or years after finishing the insulated façade walls.

How is the repair done?

Inspect the peeled area. Using your hand, check the strength of the mesh fixation next to the detached area. Prepare materials: glue and a piece of plastic reinforcing mesh. If the facade walls are painted, then you need to have the appropriate paint.
Pull the peeled mesh towards you and use a sharp mounting knife to cut it around the perimeter. Work very carefully, do not damage the foam. If the sect continues to flake off during cutting, great. In this way you remove the entire problem area; in any case, it would peel off over time.
Cut a new mesh for the patch, the size should be slightly larger than the cleared area for the overlap.
Remove the layer of old glue from the surface of the foam.
Use a spatula to carefully remove the remaining mesh from the surface. upper layer glue to the width of the new overlap. Apply the first layer of glue, embed the mesh into it and apply the second layer of glue.
After it dries, level it. Pay special attention to the docking area. It should be as smooth as possible without sudden changes in height.

How does the quality of plastic mesh depend on its price? Almost nothing. When choosing a mesh, pay attention to the thickness of the fabric and the size of the mesh cells. All other characteristics are nothing more than advertising gimmicks of the manufacturers.

The better plastic anti-corrosion coating metal reinforced mesh from galvanizing? Nothing, besides, the price of such a mesh is higher than with galvanized wire. You need to know that the adhesion of all cement mortars to plastics is significantly lower than to galvanized surfaces. As for the service life and load-bearing capacity, these indicators are absolutely identical.

Is it possible to do without reinforcing mesh when plastering uneven façade walls? Not only is it possible, but it is necessary. We have already talked about simpler and more effective methods of working with such surfaces. Reinforcement with metal mesh is used not to prevent the appearance of cracks, but to increase the bearing capacity of cement-sand mortars. It is needed when screeding the floor. One more nuance. The indicators of linear thermal expansion of metal and solution differ significantly. This means that microcracks will certainly appear in the places where cement and metal mesh meet, because outside temperatures fluctuate within significant limits. In enclosed spaces there are no such fluctuations.

Should I use reinforcing mesh on the basement surfaces of façade walls? Use this technology only for foam-insulated bases. In all other cases it is not needed.

Photo - a cake made of insulation and mesh for reinforcement

How much does the cost of finishing facade walls increase due to the use of reinforcing mesh? The cost of finishing increases by no more than 3–5%. But if we take into account possible repairs Due to mechanical damage to the foam, a slight increase in cost is quite justified.

Video - How to glue reinforcing mesh

Mesh for plaster interior walls allows for higher quality finishing of premises. This technology prevents the solution from peeling off the surface, makes the coating harder and doubles its service life.

Mesh plaster – what is it and why is it needed?

Grid plaster is one of the ways to decorate walls. This method is needed to strengthen the facing layer on uneven surfaces. It is mainly used for external surfaces of civil buildings and industrial structures. This is especially true for new houses that are still settling. But sometimes premises are also treated in this way. In this case, it is necessary to distinguish between the types of reinforcing material for external and interior work.

The cellular material can be fiberglass, polymer or metal. It all depends on where it is used. Meshes for internal plaster have their own requirements. Such material must be resistant to alkaline attack. For this reason, it is impregnated with a special solution. If this is not done, then over time cracks will appear on the cladding. This means that the base has decomposed and the plaster layer has lost its strength.

In addition to impregnation, the mesh for plastering internal walls must maintain strength and elasticity. According to SNiP, its density must correspond to the parameters 150-170 g/m2. This will give it the ability to withstand mechanical, wind and other loads experienced by the building as a whole. Typically, builders use metal mesh to protect the walls of the first floor when performing plastering work.

What type of mesh is used for plastering interior walls?

Plaster layer on concrete, brick and wooden facades cracks and peels off. To avoid this, the walls are reinforced with mesh. There are 4 types of metal mesh:

Woven mesh is a flexible and incredibly durable material. Its structure consists of woven wire of different sections. Ideal for DIY wall decoration. Has square cells 1x1 cm with zinc coating. Sold in rolls in construction stores.
Chain-link or woven mesh is suitable for strengthening multi-layer plaster. Cell size 2 cm.
Welded mesh with square cells is made by spot welding intersecting wires located perpendicular to each other. Low-carbon, polymer-coated or galvanized steel wire is used for production. Designed to prevent cracking of the finishing layer during the period of active settlement of the walls. To prevent cracks in the plaster, a mesh with 2/3 cm cells is used. It is sold in rolls 1 meter wide.
Expanded metal mesh is produced by pressing from sheet metal. First, holes are cut, and then the sheet is stretched to obtain diamond-shaped cells arranged in a checkerboard pattern. Apply under a small layer of solution. Rolls can be of different lengths, but standard width at 1 meter.

Under a very thin layer, a polymer mesh or fiberglass element is used, most often when needed or, as it is also called, “Venetian”. This type The material has increased resistance to various types of chemical influences and does not spoil the final coating with stains during use. Methods of attaching such meshes can be different. If the wall is concrete or brick, then you can apply a little mortar to it and press the reinforcing material into it. On wooden or porous surfaces, you can fix the net using a stapler.

Preparation and start of finishing work

Before you start decorating the walls, you need to prepare everything you need: tools, remove debris, think and decide which type of mesh is best to use.

Important: metal mesh is best suited for applying mortar with a thickness of 3 cm or more. Chain-linking is used when reinforcing walls that have not previously been plastered.

So, after you have everything prepared, you can begin to complete the five steps.

Measure the height from floor to ceiling. Lay out the mesh and use metal scissors to cut the required number of panels.
Straighten and attach the mesh to the primed surface with nails or screws. At the same time, do not forget that the canvases should overlap with a width of 10 cm.
Prepare. Add an antiseptic to it so that there is no mold on the plaster in the future.
Apply a preliminary layer of mortar with a trowel, then level it using the rule. Allow the fresh plaster to set, then apply a leveling layer. Because it is thinner, it should be spread directly with a grater. To do this, take a small amount of the mixture onto the working surface of the tool and, pressing it against the wall, pull it from the bottom up. If the mesh is visible, repeat the procedure.
Let it dry, then cover the uneven areas with a spatula and rub these places with a trowel. After hardening, clean up any uneven surfaces using fine sandpaper or a sponge moistened with water.

When plastering using polymer types grids, the solution should be applied from the middle to the edges of the canvas, as if you were gluing wallpaper and expelling the air from under it. Nets made of polymer materials are elastic and stretchy. When working with them, you need to be careful and make sure that no bubbles appear on them. Now, depending on what the plaster was done for, you can either paint it or do decorative cladding.

Plaster facing

Wall painting has become the most widespread. Before you begin this type of cladding, you need to evaluate the quality of the surface: remove all cracks, make sure that the plaster layer is strong and does not lag behind the wall surface. After the putty has dried, it is necessary to treat the surface before painting with a water-based primer.

Be careful when choosing the paint you are going to use to paint the plaster.

Remember: fresh plaster, as a rule, has an excess of alkali, so it is highly undesirable to use compositions containing solvents. Please note that the plaster must be protected with a synthetic primer before using organic soluble paints.

It is best to use a roller to paint walls. The surface must be treated carefully, not leaving any gaps, and after the coating has dried, it should be painted over again. Acrylic, alkyd and latex compositions are best suited for painting facades.

No less popular finishing method interior spaces wallpaper. To prevent them from peeling off, you need to properly prepare the plastered surface. Delete all old drape from the walls and make sure that the plaster is holding well. Then the cleaned surface should be washed with water and inspected for cracks. If you find them, they will need to be puttied and given time to dry. Then treat such areas with fine-grained sandpaper.

The choice of wallpaper glue depends on the type of wallpaper and the surface on which you are going to stick it. Usually there are instructions on the rolls with recommendations on which glue is best to use. In general, the technique for gluing plastered walls is not much different from the technique for other surfaces.

Without knowing how to do this or that type of repair, you can not only waste a lot of time and effort, but also ruin expensive materials. We hope that the tips given in this article will help you carry out repairs correctly and avoid many mistakes.

The surface of enclosing structures, even with their impeccable construction, needs leveling, the classic of which is plastering. The plaster coating is often reinforced with a mesh of various materials a certain mesh size. This additional step complicates and increases the cost of the process, but under certain circumstances it cannot be avoided.

Let's consider the role of reinforcement in a plaster coating, and what reinforcing mesh give preference in one case or another.

Functions of reinforcement in plaster

Reinforcement of the plaster layer is an effective, time-tested operation to improve the characteristics of the leveling coating.

The fittings in plaster perform the following functions:

Makes it possible to form a plaster coating whose thickness exceeds the maximum permissible value for the mixture used. The need for this arises when, after marking the beacon plane on the wall to be plastered, it turns out that the required thickness of the leveling layer does not fit into the characteristics of the mixture used.
Ensures the integrity of the plaster layer, preventing crack formation or neutralizing its consequences. The specific gravity of the plaster is significant, so cracks in the coating are dangerous, especially if they form in high-lying areas that do not have support under the leveling layer (above windows and doorways) – collapse of the finish can result in injury. The reinforcing mesh will prevent its collapse even if the finish peels off.
Increases the load-bearing capacity of plaster. Peeling plaster coating in case of loss of adhesion to the base, it can cause the collapse of the finish on the solid surface of the wall. This can be triggered by the load from interior elements mounted on thick-layer plaster (shelves, cornices) that are not connected to the load-bearing base. Reinforcement gives the plaster layer additional load-bearing capacity.

Plaster made from any mixture with a thickness of more than 3 cm must be reinforced to avoid delamination.

The functionality of plaster contains the answer to the question of when it is reinforced:

When performing thick-layer coating - locally or over the entire area;
If the house is located near objects that have a vibration effect on it;
In the presence of a factor of periodic uneven shrinkage of the building (redevelopment in apartments of frame houses);
To provide additional coverage bearing capacity, including for the installation of interior items and household equipment.

Types of reinforcing mesh

In the middle of the last century, plaster reinforcement was carried out by laying it on shingles, which compensated for the lack of adhesion to the base and reduced the likelihood of the coating collapsing. But installing shingles is a time-consuming operation, and the installed reinforcing lattice is modest physical characteristics It was also vulnerable to moisture and microorganisms.

Today, plaster is reinforced with special meshes, which differ in the material of manufacture, production method and mesh size, on which their scope of application depends.

The main classification of reinforcing mesh is based on the material of manufacture:

metal;
polymer;
fiberglass.

Let's consider these materials from the perspective of their suitability for reinforced plastering of various wall surfaces.

Metal mesh

Of all the meshes used in construction, the most durable are metal ones, which, according to the manufacturing method, come in the following types:

Woven - made of low-carbon, galvanized or stainless steel, brass;
Chain-link mesh – regular, galvanized or polymer-coated steel;
All-metal expanded metal mesh (TSPVS, “opening”) - made of ordinary or galvanized steel;
Welded - plain or painted steel.

The meshes also differ in wire thickness and mesh size.

Metal mesh plaster stone walls reinforced at significant differences level – more than 4 cm. From listed types The first three are suitable for an apartment - with a wire thickness of up to 1.5 mm and a rectangular mesh with a side of 4-30 mm, but not all of them are equally effective.

The “perforation” has the best characteristics - it is made of a single sheet of metal and coated with zinc, therefore it is strong, durable and significantly increases the strength of the plaster layer with a minimum of waste during installation. But the listed advantages are also taken into account in its price - the material is more expensive than the two previous types of mesh on the list, and they also cope well with the task.

Welded mesh is made from steel rods and is used to significantly increase strength characteristics wall structures– in residential conditions, the need to use them rarely arises.

With a significant thickness of the plaster layer, the fastening of the metal mesh to the load-bearing base must be strong (like the base itself - concrete, brick, blocks), so it is done with self-tapping screws or dowels with homemade washers large diameter, forming a gap between the reinforcement and the wall of at least 5 mm. Reinforcement of thick-layer plaster can be carried out in several layers - as the coating builds up.

But woven mesh made of galvanized wire or brass can also be used to reinforce thin-layer plaster - on top of expanded polystyrene or penoplex insulation, but this will cost more than using non-metallic reinforcement.

If big differences levels on the wall are local, then there is no need to reinforce the base over the entire area, especially if a ready-made cement mixture is used for leveling. Where the thickness of the plaster is less than 2 cm, you can do without reinforcement - cut the mesh and nail it to the wall along the perimeter of the cut.

Polymer reinforcing mesh

The raw materials for the manufacture of these meshes are granules of polyethylene, polyurethane, but most often polypropylene, which, after melting and mixing with optimizer additives, are extruded (pressed) through a cellular mold of a certain profile. Plastic mesh are produced with cells in the shape of a square, rhombus or hexagon. The process of their manufacture is low-cost, so polymer mesh fabrics are widely available at a price.

The technique of polypropylene extrusion under high or, conversely, low pressure with the addition of additives makes it possible to obtain a material of sufficient strength, uniform structure and fixed thickness. However, polypropylene mesh is inferior in strength to metal mesh. Mesh fabrics made from this polymer are most effectively used to prevent cracking of plaster - they should not be used to reinforce a plaster layer more than 2 cm thick. In addition, alkaline components cement-sand mixtures polypropylene is destroyed over time, so most meshes made from this polymer are more often used to reinforce gypsum coatings - but also not thicker than 2 cm. Polypropylene meshes are especially convenient for laying over foam, but you should remember that they are attached not to the insulation, but to a freshly applied layer of the mixture , pressing it into it with a roller, after which re-coating is performed.

Despite these disadvantages of polypropylene, the Astroplastika company (St. Petersburg) presents Russian market reinforcing meshes made of this material from the Italian concern Tenax, which are claimed to be chemically resistant:

“Plurima” is a cellular fabric made of threads strengthened using orientation technology, with knots at the corners of the cells (5x5, 5x6 or 6x6 mm), used for reinforcement thin layer plaster and putty (5-1 mm);
“Armaflex” is a high-strength flat mesh fabric with a 12x15 mm cell for reinforcing plasters 1-5 cm thick;
“Syntoflex” - 3 modifications marked E, M and D, high-strength mesh with cells 12x14, 17x24 and 22x35 mm.

The manufacturer managed to achieve the chemical resistance of polypropylene foam by using special polymer additives.

Polyurethane meshes are available in several modifications. They can be used to reinforce almost any leveling coating, which is why polyurethane meshes are also called universal.

Fine-cell material (5x5, 6x6 mm) is intended for reinforcing external and internal plaster coatings made of ready-made mixtures based on cement or gypsum with a thickness of 5 to 15 mm. Plastering with homemade DSP mortar on such a grid is not performed.

Meshes with a cell of 13x15 mm (medium mesh) are intended for reinforcing facade and interior plasters up to 3 cm thick, made from ready-made or home-made compositions based on any binder (cement, lime, gypsum).

Large-mesh polyurethane mesh (22x35 mm) is intended for reinforcing plaster coatings of medium and large thickness, including over large areas. Suitable for traditional solutions self-made and ready-made leveling mixtures.

To reinforce internal plaster, a polymer mesh with a cell size of 5x5 mm must have a density of at least 110 g/m2.

Fiberglass mesh for plaster reinforcement

Fiberglass filaments are produced by passing molten glass through micro-holes. Based on the place of application, meshes made from this fiber are divided into façade and interior. Both types have a cell size of 5x5 mm, but the threads of mesh for outdoor use have a higher density (160 g/m2), which determines their high tensile strength, and are impregnated with a special composition that increases frost resistance.

With wide availability at a price, high flexibility and equal specific gravity, fiberglass mesh has the following advantages over polymer canvases:

Absolute chemical inertness;
More high strength to break;
Virtually unlimited operating temperature range (melting point 1500°C).

When choosing fiberglass mesh for plaster, you should be guided by its specific gravity. The facade is reinforced with a material with a density of 90 g/m2, internal surfaces - from 60 g/m2.

There is commercially available fiberglass mesh with a cell size of 10x10 mm and a density of 450 g/m2, which is used for reinforcing thick-layer plaster coatings over large areas, but in apartment conditions the outstanding characteristics of such a material will remain unclaimed.

Conclusion

Choosing a mesh for reinforcing plaster is not difficult. You just need to know the place of application, the maximum thickness of the future plaster coating and the leveling material.

As for the prices for reinforcing material, in Moscow and the Moscow region they are approximately the same.

When plastering wall surfaces in any room, specialists use reinforcing mesh under the plaster to prevent peeling of the plaster layer and the appearance of cracks. A special mesh helps strengthen the main finishing material.

Varieties

There are several types of mesh for plaster; They differ in operating parameters and features of use. Today, a number of manufacturers offer a large assortment mesh products.

The following varieties are distinguished:

Prices

How much does mesh for plaster cost? The cost of mesh intended for plastering wall surfaces differs. The price is determined based on the type of product and the material from which it is made, and operational parameters.

Approximate price:

woven fiberglass (1x55 m) - from 750 to 8000 rubles, depending on density;
based on polypropylene (1x30 m) - from 700 to 1200 rubles;
made of steel (1x10 m) - from 50 to 95 rubles;
with galvanized coating - from 350 to 580 rubles.

Subtleties of choice

The need to use reinforcing mesh devices arises when plastering bases made of concrete, wood and brick.

Attention! If the mesh is not used, the likelihood of peeling of the facing material increases.

The choice of the type of construction reinforcing mesh depends on the type of work to be performed, the thickness of the finishing layer and the conditions of use.

What mesh is needed for plastering walls and which is better? There are several rules that help you decide: which type of mesh is more suitable and in which situations, and in which cases you can do without using a reinforcing product.

For cladding ceiling surface, monolithic load-bearing structures made of reinforced concrete and plaster density less than 10 mm, it is not necessary to use mesh padding.

It is advisable to install fiberglass mesh with a finishing density of less than 30 mm.

Metal ones should be used with a density of more than 30 mm.

With galvanized coating - considered the best option For facade works and for internal lining in high humidity conditions.

Reinforcement plastic look It is preferable to use mesh for finishing layers with a maximum thickness of 20 mm, as well as in cases where there is a possibility of subsidence of the base. Ideal for plaster surfaces.

To eliminate shallow cracks and mask joints, you can use adhesive tape: it will add strength to weakened areas of the base.

To reinforce slopes with a large layer of plaster, steel mesh is used, and with a small layer, a fiberglass product is used. If the slope width exceeds 15 cm and the plaster layer is less than 6 mm, reinforcement is still used.

Plastering wall surfaces using a grid

Plaster mortar allows you to level wall surfaces, but if there are a large number of cracks or other defects on the walls, plastering alone is not enough to smooth the base. In such a situation, it is recommended to use wall reinforcement using a special mounting mesh.

Reinforced surfaces become stronger and their ability to withstand mechanical pressure increases.

The technology for plastering wall surfaces includes several stages:

Preparing the base. First of all, the old finishing material is removed from the surface and crumbling areas are leveled. After removing the worn layer, the base is cleaned of dust and dirt; if there is mold, it is scraped off with a steel brush. After this, the cleaned surface is coated with a primer in order to improve the adhesion of the base to the plaster material and protect the wall from the effects of harmful microorganisms.
Installation of reinforcing mesh. The first step is to measure the height of the wall, and then cut the canvas to the required size. Cut the mesh using scissors designed for cutting metal. The cuts are attached to the wall surface by overlapping them by about 10 cm. How to secure the mesh for plaster? It is fastened with self-tapping screws, fixed with washers or galvanized tape.
Installation of plaster beacons. To level the surface, it is preferable to use a plaster profile. First, the location of the outer beacon is indicated (vertically); they should be secured with two screws. After this, the outer beacon is mounted with reverse side. To evenly position all the guides, pull the thread between the outer beacons. Then install intermediate beacons at a distance smaller than the length of the rule.

On a note! Use a level to check the position of the beacon.

Plaster coating. Before you start applying the material, prepare a solution with a consistency close to sour cream. The primary layer is applied by spraying using a trowel so that the solution seeps through the mesh and adheres to the wall. It is important that the solution does not flow down the wall. The spray density is about 10 mm. After the primary layer has dried, prepare a thicker substance and apply it to the wall surfaces with a trowel. Level the surface using a rule, pressing it against the beacons and turning from bottom to top to remove excess solution. After the plaster layer has dried, remove the beacons and fill the recesses with mortar.

Aligning corners. The joints between the ceiling surface and the wall are leveled manually with an angled spatula. External corners are leveled using perforated steel corners. This completes the work of plastering the walls.

We considered the option of installing steel plaster mesh. Installation based on durable materials is slightly different.

Installation method for fiberglass mesh:

Preparing to install fiberglass reinforcing material is no different from similar work for attaching steel mesh.

Attention! When applying the solution, make sure that it is evenly distributed over the surface of the mesh, smooth it out - from the center of the canvas to the edges. Press the edges at the corners with a rule or an angular spatula.

The method of installing a polymer mesh involves a number of stages.

At the first stage, the base is prepared. Preparatory work include cleaning and priming the surface.
The next step is to measure the wall surfaces and cut the canvas in accordance with the measurements taken and add a margin of approximately 10 cm (for overlapping panels).
After this, the glue-based composition is prepared.
The main stage is applying the initial plaster layer with a density of 3-5 mm with pressing the painting mesh into the solution.
After the initial layer has dried, the surface is covered with a primer and the final layer of plaster is applied, leveling is carried out as a rule.
On last stage dried wall surfaces are sanded.

A few useful quick tips will allow you to complete the job of plastering walls with the highest quality possible.

The denser the plaster layer applied to the base of brick or concrete, the stronger the mounted steel mesh should be.
Simple steel mesh in rooms with high level humidity, for example, in baths and bathrooms, as well as for external cladding, it is undesirable to use. The whole point is that steel types materials are prone to rust. It is preferable to install a mesh made of fiberglass or welded with a galvanized coating.
Before installing a metal reinforcing product, it must be degreased.
It is unacceptable to use a reinforcing mesh made of plastic for plaster mortar prepared on the basis of cement, since over time the cement mixture will corrode the product.
Many people, when performing work on plastering walls, first lay the mesh to the wall surface and only then plaster - professionals do not advise doing this: as a result, cavities may form in the cells and the degree of adhesion will decrease.
When calculating the required number of dowels, keep in mind that per 1 sq. m. approximately 16-20 pcs are required.
When installing reinforcing material, do not allow it to sag or peel off from the surface by more than 10 mm.
For internal cladding, as well as for external cladding, the best option will use a reinforcing mesh with cells with a diameter of 5x5 mm and 10x10 mm.
The fiberglass mesh must be impregnated with a polyacrylic compound. If the mesh is not impregnated, it cannot be used with plaster mortar, otherwise it will gradually collapse under the influence of alkalis.
If for finishing wooden surfaces shingles were used on the walls; it is preferable to choose a chain-link mesh.
With a layer density of about 50 mm, due to strong surface differences, it is undesirable to plaster the walls. Preferably used for decoration Wall panels- this finishing material will help hide existing defects.
In the case of plastering small areas, it can be used as fasteners. plaster mixture. It is applied pointwise, after which it is evenly distributed over the entire area.

The use of reinforcing plaster mesh in the process of performing internal work on plastering wall surfaces allows this to be done efficiently. The presence of a mesh extends the service life of the finishing material; the main thing is to choose the right type of reinforcing mesh, based on the conditions of its use.

Video

Watch the features of plastering walls with mesh in the video:

Selecting a mesh for plastering indoors and for facade work. What kind of mesh is available on the construction market. Correct fastening various types mesh to the surface.

Mesh for plastering walls

Often, repair work comes down to leveling the walls. This is done both in new premises and during major renovations.

It is also possible to level the walls with plaster on the outside of the building. For all these works, in most cases, a mesh is used for plastering walls. Which mesh is used outside and which inside is discussed below.

Necessity

Previously, shingles were used to ensure surface strength and long-lasting plaster. It was made from wooden slats, nailed to the base. Now on the construction market there is mesh for plastering. They vary in color and material. Serve for better adhesion to the surface, there is no peeling of the applied layer from the rough base long time, there are no cracks after the solution dries. After applying the material under the plaster and drying the solution, decorative finishing is applied without fear that defects will appear underneath.

What happens: varieties

The construction market is full of a variety of cellular materials for plastering surfaces. They are mainly produced from:

metal;
fiberglass;
plastic.

Each grid is designed to perform a specific job. A brief description is presented in the table:

For each type of work apply various sizes cells.

Reinforcement under the facade: which one is needed

To work outdoors with building walls, many factors need to be taken into account:

humidity;
temperature changes;
constant exposure sun rays and so on.

To select a cellular material, the following indicators are taken into account:

The density of the fabric used is 145-160g/m2. Cell size 5x5.
Strength. Net good quality does not tear, does not deform.
The fabric is not exposed to alkali or moisture.

Metal sheets are mainly used. However, they produce fiberglass mesh for facade work. It should not stretch or tear.

Metal for leveling

This is a universal canvas, used indoors and outdoors. Its functions include protecting the surface from mechanical influences and strengthening the created plane. The mesh prevents the solution from spreading (this applies to cement mixtures that have shrinkage).

Manufacturing is done using wire or metal rods. Depending on this, the material is divided into light, medium, heavy.

Features of metal sheets:

Withstands loads. Therefore they are used on large area with the application of a thick layer of solution.
Metal is applicable on concrete, brick and other surfaces.
The minimum thickness of the applied solution is 2 cm, the maximum is 5 cm.
Cell holds thick layer plaster, thereby ensuring the strength of the surface.
Easily cut with metal scissors or wire cutters.

The disadvantage is the weight. The canvas is attached only to solid rough foundations.

Do not use on hollow bricks.

Plastic decorative

For covering indoor surfaces finishing material, paint, it must be perfectly smooth and durable. There should be no cracks, chips, or voids. To align and create solid foundation use a painting mesh.

The fabric is made from polymers or fiberglass. It is safe for health, durable, does not react to moisture and does not deform.

Used on various surfaces: concrete, brick, foam blocks when applying a solution with a thickness of 2 to 5 mm.

Before applying the solution, the canvas is attached to the rough base. It should not sag or be too tight.

The material has differences in cell sizes. This is important when using different solutions on areas from minimal to large.

Fiberglass for wooden walls and more

The canvas, 2x2 cells, is durable and resistant to aggressive environments.

It is used for ceilings and walls indoors. The function is to prevent cracks from appearing on the created surface after drying.

Material Features:

Weight. Due to its light weight, it is used on various rough substrates.
Long warranty period. Fiberglass has a longer lifespan than metal.
Thermal conductivity. The material conducts heat poorly, so it is used to reduce cold bridges.

Disadvantages of the material:

price – more expensive than metal sheet;
cannot tolerate high temperatures;
does not bend;
brittle.

Despite the shortcomings of the material, it is used for wooden base, which allows you to level it and make it durable.

Which one is best to use for plastering?

Reinforcing mesh is produced for a specific type of work. To determine the choice, there are several rules:

A 3 cm layer of applied mortar should be made of fiberglass.
Metal gratings are used when applying a solution with a thickness of 3 cm or more. When carrying out external work. And also for plastering baths and swimming pools.
The plastic cell is designed for coating with gypsum solutions.
Serpyanka and other tapes are used to reinforce plasterboard joints and cracks.
Chain-link and fiberglass are used to finish the stove and fireplace. The first option is for cement-clay mortar, the second is for thin plaster.

These rules will help in choosing cellular fabric for certain jobs.

For interior work

For interior work, several types of mesh are used.

Polymer material. Used for plastering surfaces with gypsum-based mixtures. A 2x2 cell will hold gypsum mortar and will not crack the surface.
Fiberglass. Mounted on a rough foundation made of brick or concrete. Holds cement mortar perfectly. It shrinks less, and when dry, cracks do not appear on the surface.

Attention. Using cellular fabric, the work goes quickly and easily. The surface is durable and has a long service life.

For outdoor

To work with outdoor surfaces, you need to choose the right mesh. To do this, follow the rules:

the choice depends on the plaster used;
dimensions of the surface on which the work will be carried out;
thickness of the mortar layer applied to the walls;
humidity, temperature changes.

Fiberglass cloth. Working with small square meters facade surface.

Metal applicable:

The wall area is large;
a wall made of aerated concrete or brick, as well as wood;
If high humidity or sudden changes in temperature;
if the mortar used is cement-based;
if increased strength is needed for the walls of the building.

Reinforcing metal is available in the following options:

Chainlink.
Welded type.
Expanded metal mesh PVA;
Solid drawn PVA.

For various works I apply Various types grids

Do I need a mesh on plastered walls?

If you do not use a reinforced sheet, peeling of the plaster from the rough base may occur. This will be affected by its own weight - the thicker the plaster layer, the heavier it is. Thanks to the mesh, after the solution dries, a monolith is obtained.

By using a mesh, you don’t have to worry about the fact that cracks of various types will appear on the wall over time.

Even if the solution was made incorrectly (liquid or, on the contrary, thick), the drain will adhere to the surface and will not cause destruction, shedding, or running off.

Fastening the mesh using technology

Reinforced material used for plastering walls and ceilings must be correctly attached to the base. Each type of cellular fabric is attached using the specified technology.

Some types of mesh cannot be stretched too much or allowed to sag. This can lead to serious consequences.

How to attach reinforced

Technique for fastening metal cellular fabric:

First of all, measure right size canvas from bottom to top.
First, the material is fixed at the top. To do this, dowel-nails are fixed at the top corners. The corners of the mesh are placed on them and pressed with self-tapping screws.
After which the same work is carried out below.
On the ceiling, the operation is performed in the same way - first the corners are attached, then in the middle.
The material must be fixed in the middle so that it is adjacent to the rough base in all places. If there is sagging, then the work will be in vain.

The metal sheet is tensioned without sagging.

How to attach a decorative plaster base

Decorative reinforcing fabric is attached using ordinary self-tapping screws. They are not completely screwed into the rough base at equal intervals. A mesh is put on them and completely twisted into the base.

Attention. The mesh should not be too tight, but there should not be any sagging.

There is an option for mounting on a mounting tape. However, there is a risk of the canvas tearing off the surface during plastering work.

Is it possible to glue wallpaper on plastered walls under a mesh?

The reinforcing fabric gives strength to the base. It will not move away from the rough wall or ceiling and will not sag like a belly. Plaster with mesh is durable and can withstand the load of decorative finishing. Therefore, after making sure that the walls or ceiling are plastered using a mesh, you can safely glue any type of wallpaper without fear of cracks appearing underneath or the base falling off.

Benefits of subsequent work

One of the main advantages is the application of the solution. And if gypsum mixture fits well on the base, then with cement material work hard. It is the mesh with its cells that holds it on the surface until it hardens and does not shrink too much.

After the material has hardened, the plastered wall can be puttyed without fear. It can be painted and covered with decorative plaster. There is no threat that a crack will appear in the middle of the wall due to shrinkage of the house.

Laying tiles is also possible on reinforced wall. The use of mesh provides surface rigidity for a long time.

Reinforced mesh should be used for plastering work. Each material – metal cells, polymer – has a specific application. By properly fixing the mesh and plastering the wall or ceiling, the surface will remain in its original form for up to 20 years.